Long-term performance study applying a tandem AnSBR-ASBR to treat wastewater containing N, N-dimethylformamide: Sludge physicochemical properties, microecology, and functional genes

Cao, Linlin; Su, Chengyuan; Lu, Yiying; Wu, Jinyan; Wei, Lixin; Liao, Junjie; Xian, Yunchuan; Gao, Shu

doi:10.1016/j.jece.2023.109447

Cited by 8 publications

(3 citation statements)

References 60 publications

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“…In this section, we present the results of simulating the binding of the inhibitor to the active TiCl 3 /Mg 8 Cl 16 center, as illustrated in Figure 7 a. The choice of this model is based on previous calculations that suggest that the coordination of TiCl 4 with the (104) plane is quite weak or even unstable, whereas the coordination of TiCl 4 with the (110) plane is energetically favored [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ].…”

Section: Resultsmentioning

confidence: 99%

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Dimethylformamide Impurities as Propylene Polymerization Inhibitor

Hernández-Fernández,

González-Cuello,

Ortega-Toro

2023

Polymers

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This research study examined how the use of dimethylformamide (DMF) as an inhibitor affects the propylene polymerization process when using a Ziegler–Natta catalyst. Several experiments were carried out using TiCl4/MgCl2 as a catalyst, aluminum trialkyl as a cocatalyst, and different amounts of DMF. Then, we analyzed how DMF influences other aspects of the process, such as catalyst activity, molecular weight, and the number of branches in the polymer chains obtained, using experimental and computational methods. The results revealed that as the DMF/Ti ratio increases, the catalyst activity decreases. From a concentration of 5.11 ppm of DMF, a decrease in catalyst activity was observed, ranging from 45 TM/Kg to 44 TM/Kg. When the DMF concentration was increased to 40.23 ppm, the catalyst activity decreased to 43 TM/Kg, and with 75.32 ppm, it dropped even further to 39 TM/Kg. The highest concentration of DMF evaluated, 89.92 ppm, resulted in a catalyst productivity of 36.5 TM/Kg and lost productivity of 22%. In addition, significant changes in the polymer’s melt flow index (MFI) were noted as the DMF concentration increased. When 89.92 ppm of DMF was added, the MFI loss was 75%, indicating a higher flowability of the polymer. In this study, it was found that dimethylformamide (DMF) exhibits a strong affinity for the titanium center of a Ziegler–Natta (ZN) catalyst, with an adsorption energy (Ead) of approximately −46.157 kcal/mol, indicating a robust interaction. This affinity is significantly higher compared to propylene, which has an Ead of approximately −5.2 kcal/mol. The study also revealed that the energy gap between the highest occupied molecular orbital (HOMO) of DMF and the lowest unoccupied molecular orbital (SOMO) of the Ziegler–Natta (ZN) catalyst is energetically favorable, with a value of approximately 0.311 eV.

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Section: Resultsmentioning

confidence: 99%

“…In particular, a substance that can promote poisoning in polypropylene production is dimethylformamide (DMF), an organic chemical compound belonging to the amide family [ 25 ]. It is a colorless liquid with low volatility that is highly soluble in water and most organic compounds [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Dimethylformamide Impurities as Propylene Polymerization Inhibitor

Hernández-Fernández,

González-Cuello,

Ortega-Toro

2023

Polymers

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“…Waste liquid recycling is an important method for solving the problem of DMF waste liquid. Currently, many enterprises have begun to adopt scientifically effective waste liquid recycling processing methods, such as bio-treatment technology and physical and chemical treatment technology [ 7 , 8 , 9 ]. These technologies can effectively recover DMF, reducing pollution in the environment.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a Solvent-Resistant Nanofiltration Membrane of Liquefied Walnut Shell Modified by Ethylenediamine

et al. 2023

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N,N-dimethylformamide (DMF) has excellent chemical stability and is widely used as an aprotic polar solvent. In order to reduce production costs and reduce pollution to the surrounding environment, it is necessary to recycle and reuse DMF. Previous research has found that the thin film composite nanofiltration membrane prepared from liquefied walnut shells exhibited a high rejection rate in DMF, but relatively low permeance and mechanical strength. In order to increase permeance without compromising the separation performance, ethylenediamine (EDA) is used as a modifier to graft onto the structure of liquefied walnut shell through the Mannich reaction. Then, modified liquefied walnut shell as an aqueous monomer reacts with trimesoyl chloride (TMC) via the interfacial polymerization method on the EDA-crosslinked polyetherimide (PEI) membrane. The results show that the permeance of the prepared membrane is significantly improved by an order of magnitude, demonstrating a rejection rate of 98% for crystal violet (CV), and a permeance of 3.53 L m−2 h−1 bar−1 in DMF. In conclusion, this study reveals the potential of utilizing liquefied walnut shells as raw materials for preparing high-performance separation membranes and demonstrates that surface modification is a feasible approach to enhance permeance of membranes without sacrificing the rejection rate.

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Combined High-Temperature Acid Digestion, Iron-Carbon Micro-electrolysis, and Coagulation Reaction for Degrading Pharmaceutical Wastewater with a High Concentration of Dimethylformamide

Ma,

Cai

2023

Lecture Notes in Civil Engineering

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Long-term performance study applying a tandem AnSBR-ASBR to treat wastewater containing N, N-dimethylformamide: Sludge physicochemical properties, microecology, and functional genes

Cited by 8 publications

References 60 publications

Dimethylformamide Impurities as Propylene Polymerization Inhibitor

Dimethylformamide Impurities as Propylene Polymerization Inhibitor

Preparation of a Solvent-Resistant Nanofiltration Membrane of Liquefied Walnut Shell Modified by Ethylenediamine

Combined High-Temperature Acid Digestion, Iron-Carbon Micro-electrolysis, and Coagulation Reaction for Degrading Pharmaceutical Wastewater with a High Concentration of Dimethylformamide

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